Looper mechanism for sewing-machines.



Patented lune 4, mm. L. UNDEBDONK.

LODPER MECHANISM FOR-SEWING MACHINES.

(Application filed Nov. 23, 1896.)

(No Model.)

I zg rzeaaea' TED TATES PATEN EEICE.

LANSING CNDERDCNK, CE WINTI-IROP, MASSACHUSETTS, ASSIGNOR T UNION SPECIAL sEwINCr MACHINE COMPANY, OF CHICAGO, ILLINOIS.

LOOPER MECHANISM FOR SEWING-MACHINES.

SEEGIFICATION forming part of Letters Patent No. 675,789, dated June 4, 1901.

Application filed November 23, 1896. Serial No. 613,174. (No model.)

To aZZ whom it may concern.-

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at Winthrop, in the county of Suffolk, State of Massachusetts,haveinvented certain new and useful Improvements in Sewing-Machines, of which the following is a description, reference being had to the accompanying drawings, and to the figures of reference marked to thereon.

My invention relates to an improvement in sewing-machines, and particularly to mechanism for supporting and operating the looper which causes the under thread to cooperate with the needle i thread to form a double chain-stitch.

In an application filed of even date herewith, Serial No. 613,173, which was forfeited and a renewal application thereupon filed September 21, 1900, Serial No. 30,720, I have shown, described, and claimed a construction in which an inclined crank-pin gives oscillatory movement to the looper-carrier in a manner known in the, art, the looper-carrier being supported on a pivoted yoke, which in said application is illustrated as fulcrumed on the said driving-pin and derives its motion by any suitable connecting means operated from the main shaft.

The present device in so far as the means for operating the looper-carrier and for CS- cillating the pivoted yoke supportingthe same are concerned may be of any desired construction-for instance, as shown in the 5 aforesaid application; but the invention differs in various detail therefrom, which will be hereinafter described and referred to in the appended claims.

In the accompanying drawings, Figure 1 0 represents a side View, partlyin section, of a portion of a sewing-machine embodying my invention. Fig. 2 is a side view of aportion of the inclined crank with the looper-carrier in section. Figs. 3 and 4: are details of parts 5 of the apparatus going to make up my invention. Fig. 5 is a detail front view of the yoke.

In the drawings the driving-shaft of the machine is shown at l, and carries forward of its front or outer bearing the inclined or bent pin 2, forminga crank which engages the forwardly projecting wings or flanges 3 on the looper-carrier 4, which looper-carrier is pivoted on a yoke 8, having a downwardlyextending arm 24, engaging freely, by means of a sliding pivot connection 5, a frame 17, which is suitably pivoted in the frame of the machine and is oscillated by means of a fork connection 6, which embraces an eccentric 7 on the driving-shaft. Instead of, as in the application mentioned, fulcruming the yoke .on the driving-shaft directly, I dispense with the sleeve in the yoke, which is desirable 'under such circumstances, and provide a stud or short shaft 9, which runs transversely through the looper-carrier and through which stud or shaft passes the bent pin or crank, the said stud or shaft therefore supporting the looper-carrier, and consequently the yoke attached thereto, upon the driving-pin. This stud or shaft 9 is pivoted on the driving-pin and admits of a swinging movement on the driving-pin and also admits of the drivingpin turning or revolving in it and is supported by cone-studs on the yoke 8.

In the rotation of the driving-shaft the bent pin oscillates the looper-carrier 4, which swings on the stud or shaft 9, while in the 0scillating movement of the yoke 8 the said stud or shaft 9 oscillates on the driving-pin, thus allowing for the sidewise movement of the looper.

At the forward end the opening 10 in the stud or shaft 9, through which the drivingpin passes, is enlarged or beveled outwardly at a little more of an angle than the angle at which the bent portion of the driving-pin extends, thus avoiding any friction or binding during the rotation of the driving-pin.

As the center of the stud or shaft 9 coincides with the center of the driving-pin at 0 the bend, as shown in Fig. 2, it will be seen that the angle of the driving-pin will keep the stud or shaft 9, and therefore the looper-carrier, up to the central point at all times except when the bent end of the pin lies longi- 5 tudinal with the jaws of the looper-carrier, in which event the looper-carrier may be slid back, thus preventing revolution of the driving-pin.

Having thus described my invention, what attached to said stud or shaft, substantially as described.

3. In the herein-described machine,the yoke; means for oscillating it, the driving-pin, the shaft or stud pivoted on said driving-pin and supported in the yoke,a looper-carrier sleeved on said shaft or stud and operatively engaging the driving l pin; substantially as described.

In testimony whereof I affix my signature 25 in presence of two Witnesses.

LANSING ONDERDONK; Witnesses:

CHAS. L. STURTEVANT, F. S. FAWCETT. 

